But Imran Mostafa said he had turned to crime because of his hook-handed dad’s notoriety.

He said he was isolated and shunned by schoolmates. Roderick Price, defending, said Mostafa had been hit hard by Hamza’s recent extradition to the US, adding: “He knows he will never see his father again.”

Mostafa, 20, of Slough, Berks, was in a gang who used a handgun and sledge- hammer in a “sophisticated and well planned” raid on a jewellery store in King’s Lynn, Norfolk.

Gems worth about £70,000 were stolen.

Ian James, prosecuting, told Norwich Crown Court: “Some kind of smoke producing device was set off causing the attention of the public to be diverted to the van they used and shielding from public view the identity of those involved.”

Mostafa had denied robbery and possessing a firearm with intent to commit an offence along with 18-year-old Jonathan Abdul from London.

They were sentenced alongside Ossama Hamed, 19, of Fulham, south-west London, and Ahmed Ahmed, 20, of Enfield, north London.

Abdul will serve 11 years in a youth offenders institution, Hamed will serve eight years and three months and Ahmed seven years and four months.